Call `IHtmlHelper` methods from extension methods

- don't call other extension methods
- #847 line 7
- remove extension methods that do nothing but pass through to the interface method
 - weren't exactly ambiguous (interface method wins) but were useless

src/Microsoft.AspNet.Mvc.Core/Rendering/HtmlHelperInputExtensions.cs

@@ -107,7 +107,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
 
         public static HtmlString TextBox([NotNull] this IHtmlHelper htmlHelper, string name)
         {
-            return TextBox(htmlHelper, name, value: null);
+            return htmlHelper.TextBox(name, value: null, format: null, htmlAttributes: null);
         }
 
         public static HtmlString TextBox(
@@ -115,7 +115,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
             string name,
             object value)
         {
-            return TextBox(htmlHelper, name, value, format: null);
+            return htmlHelper.TextBox(name, value, format: null, htmlAttributes: null);
         }
 
         public static HtmlString TextBox(
@@ -124,7 +124,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
             object value,
             string format)
         {
-            return TextBox(htmlHelper, name, value, format, htmlAttributes: null);
+            return htmlHelper.TextBox(name, value, format, htmlAttributes: null);
         }
 
         public static HtmlString TextBox(
@@ -133,41 +133,25 @@ namespace Microsoft.AspNet.Mvc.Rendering
             object value,
             object htmlAttributes)
         {
-            return TextBox(htmlHelper, name, value, format: null, htmlAttributes: htmlAttributes);
+            return htmlHelper.TextBox(name, value, format: null, htmlAttributes: htmlAttributes);
-        }
-
-        public static HtmlString TextBox(
-            [NotNull] this IHtmlHelper htmlHelper,
-            string name,
-            object value,
-            string format,
-            object htmlAttributes)
-        {
-            return htmlHelper.TextBox(name, value, format, htmlAttributes);
         }
 
         public static HtmlString TextBoxFor<TModel, TProperty>([NotNull] this IHtmlHelper<TModel> htmlHelper,
             [NotNull] Expression<Func<TModel, TProperty>> expression)
         {
-            return TextBoxFor(htmlHelper, expression, format: null);
+            return htmlHelper.TextBoxFor(expression, format: null, htmlAttributes: null);
         }
 
         public static HtmlString TextBoxFor<TModel, TProperty>([NotNull] this IHtmlHelper<TModel> htmlHelper,
             [NotNull] Expression<Func<TModel, TProperty>> expression, string format)
         {
-            return TextBoxFor(htmlHelper, expression, format, htmlAttributes: null);
+            return htmlHelper.TextBoxFor(expression, format, htmlAttributes: null);
         }
 
         public static HtmlString TextBoxFor<TModel, TProperty>([NotNull] this IHtmlHelper<TModel> htmlHelper,
             [NotNull] Expression<Func<TModel, TProperty>> expression, object htmlAttributes)
         {
-            return TextBoxFor(htmlHelper, expression, format: null, htmlAttributes: htmlAttributes);
+            return htmlHelper.TextBoxFor(expression, format: null, htmlAttributes: htmlAttributes);
-        }
-
-        public static HtmlString TextBoxFor<TModel, TProperty>([NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TProperty>> expression, string format, object htmlAttributes)
-        {
-            return htmlHelper.TextBoxFor(expression, format: format, htmlAttributes: htmlAttributes);
         }
 
         public static HtmlString TextArea([NotNull] this IHtmlHelper htmlHelper,
@@ -194,12 +178,6 @@ namespace Microsoft.AspNet.Mvc.Rendering
             return htmlHelper.TextArea(name, value, rows: 0, columns: 0, htmlAttributes: htmlAttributes);
         }
 
-        public static HtmlString TextArea([NotNull] this IHtmlHelper htmlHelper,
-            string name, string value, int rows, int columns, object htmlAttributes)
-        {
-            return htmlHelper.TextArea(name, value, rows, columns, htmlAttributes);
-        }
-
         public static HtmlString TextAreaFor<TModel, TProperty>([NotNull] this IHtmlHelper<TModel> htmlHelper,
             [NotNull] Expression<Func<TModel, TProperty>> expression)
         {
@@ -211,11 +189,5 @@ namespace Microsoft.AspNet.Mvc.Rendering
         {
             return htmlHelper.TextAreaFor(expression, rows: 0, columns: 0, htmlAttributes: htmlAttributes);
         }
-
-        public static HtmlString TextAreaFor<TModel, TProperty>([NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TProperty>> expression, int rows, int columns, object htmlAttributes)
-        {
-            return htmlHelper.TextAreaFor(expression, rows, columns, htmlAttributes);
-        }
     }
 }

src/Microsoft.AspNet.Mvc.Core/Rendering/HtmlHelperLabelExtensions.cs

@@ -42,7 +42,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
 
         public static HtmlString LabelForModel([NotNull] this IHtmlHelper html)
         {
-            return LabelForModel(html, labelText: null);
+            return html.Label(expression: null, labelText: null, htmlAttributes: null);
         }
 
         public static HtmlString LabelForModel([NotNull] this IHtmlHelper html, string labelText)

src/Microsoft.AspNet.Mvc.Core/Rendering/HtmlHelperLinkExtensions.cs

@@ -188,25 +188,5 @@ namespace Microsoft.AspNet.Mvc.Rendering
                                  routeValues: routeValues,
                                  htmlAttributes: htmlAttributes);
         }
-
-        public static HtmlString RouteLink(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string linkText,
-            string routeName,
-            string protocol,
-            string hostName,
-            string fragment,
-            object routeValues,
-            object htmlAttributes)
-        {
-            return htmlHelper.RouteLink(
-                                 linkText,
-                                 routeName,
-                                 protocol,
-                                 hostName,
-                                 fragment,
-                                 routeValues,
-                                 htmlAttributes);
-        }
     }
 }

src/Microsoft.AspNet.Mvc.Core/Rendering/HtmlHelperValidationExtensions.cs

@@ -44,15 +44,6 @@ namespace Microsoft.AspNet.Mvc.Rendering
             return htmlHelper.ValidationMessage(expression, message, htmlAttributes, tag: null);
         }
 
-        public static HtmlString ValidationMessage([NotNull] this IHtmlHelper htmlHelper,
-            string expression,
-            string message,
-            object htmlAttributes,
-            string tag)
-        {
-            return htmlHelper.ValidationMessage(expression, message, htmlAttributes, tag);
-        }
-
         public static HtmlString ValidationMessageFor<TModel, TProperty>([NotNull] this IHtmlHelper<TModel> htmlHelper,
             [NotNull] Expression<Func<TModel, TProperty>> expression)
         {
@@ -82,15 +73,6 @@ namespace Microsoft.AspNet.Mvc.Rendering
             return htmlHelper.ValidationMessageFor(expression, message, htmlAttributes: null, tag: tag);
         }
 
-        public static HtmlString ValidationMessageFor<TModel, TProperty>([NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TProperty>> expression,
-            string message,
-            object htmlAttributes,
-            string tag)
-        {
-            return htmlHelper.ValidationMessageFor(expression, message, htmlAttributes, tag);
-        }
-
         public static HtmlString ValidationSummary([NotNull] this IHtmlHelper htmlHelper)
         {
             return htmlHelper.ValidationSummary(excludePropertyErrors: false,
@@ -168,14 +150,5 @@ namespace Microsoft.AspNet.Mvc.Rendering
         {
             return htmlHelper.ValidationSummary(excludePropertyErrors, message, htmlAttributes, tag: null);
         }
-
-        public static HtmlString ValidationSummary([NotNull] this IHtmlHelper htmlHelper,
-            bool excludePropertyErrors,
-            string message,
-            object htmlAttributes,
-            string tag)
-        {
-            return htmlHelper.ValidationSummary(excludePropertyErrors, message, htmlAttributes, tag);
-        }
     }
 }